inequality is a special case of equality

2 files changed, 48 insertions, 0 deletions

diff --git a/spec/algebra/unit/predicates/inequality_spec.rb b/spec/algebra/unit/predicates/inequality_spec.rb
new file mode 100644
index 0000000000..557494e2cd
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+++ b/spec/algebra/unit/predicates/inequality_spec.rb
@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+module Arel
+  module Predicates
+    describe Inequality do
+      before do
+        relation1 = Arel::Table.new(:users)
+        relation2 = Arel::Table.new(:photos)
+        left      = relation1[:id]
+        right     = relation2[:user_id]
+        @a        = Inequality.new(left, right)
+        @b        = Inequality.new(right, left)
+      end
+
+      describe '==' do
+        it "is equal to itself" do
+          @a.should == @a
+        end
+
+        it "should not care abount children order" do
+          @a.should == @b
+        end
+      end
+    end
+  end
+end
diff --git a/spec/algebra/unit/predicates/predicate_spec.rb b/spec/algebra/unit/predicates/predicate_spec.rb
new file mode 100644
index 0000000000..6acc047cbb
--- /dev/null
+++ b/spec/algebra/unit/predicates/predicate_spec.rb
@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+module Arel
+  module Predicates
+    describe Polyadic do
+      before do
+        @relation1 = Arel::Table.new(:users)
+        @relation2 = Arel::Table.new(:photos)
+        @a = @relation1[:id]
+        @b = @relation2[:user_id]
+      end
+
+      describe '==' do
+        left = Polyadic.new @a, @b
+        right = Polyadic.new @b, @a
+
+        left.should != right
+        left.should == right
+      end
+    end
+  end
+end